EN Chapter 7 Troubleshooting 245
High-voltage power supply functional check
The high-voltage power supply assembly provides the necessary voltages for the printer’s
electrophotographic processes. The +24 B VDC supply is used to power the high-voltage power
supply assembly. A summary of the major components of the high-voltage system is given in table.
Table 43. High voltage system checks
Checks Action
Are the connectors for the primary charge
roller, drum ground, developing bias, and
toner level sensor damaged, corroded,
contaminated, or missing?
1. Inspect and correct each item.
2. Check the toner cartridge.
3. Check all wire connections.
4. Replace the engine controller board if
the connection cannot be repaired.
Are the high-voltage power supply
connections contaminated, bent, or
broken?
1. Clean the terminals with alcohol only.
2. Check all wire connections.
3. Replace the engine controller board if
the connection cannot be repaired.
Is the internal toner cartridge damaged? Replace the toner cartridge.
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